Assembly Design pptx

Assembly Design - Inserting documents, Page 11© Wichita State University Assembly Design The first section of this manual will involve inserting, creating, and replacing documentsand oth

Assembly Design

NATIONAL INSTITUTE FOR AVIATION RESEARCH

Wichita State University

Revision 5.14

Copyright 2005 All rights reserved.

www.cadcamlab.org

National Institute for Aviation Research

Wichita State University

Wichita, KS

Copyright 2005 All rights reserved.

www.cadcamlab.org

Table of Contents, Page i

© Wichita State University

TABLE OF CONTENTS

Introduction 1

Assembly Design 2

Pull Down Menus 3

Edit 3

Insert 5

Tools 7

Analyze 8

Assembly Design Workbench 9

Assembly Design 11

Inserting Documents 11

Replacing and Creating New Parts 17

Reordering and Numbering the tree 23

Bill of Material 25

Constraining and Manipulating Parts 31

Bounding Box 33

Manipulation 33

Coincidence Constraint 34

Contact Constraint 37

Snap 42

Defining a Multi Instantiation 43

Smart Move 45

Modifying a part to create a new part while in an assembly 48

Fast Multi Instantiation 50

Fix Constraint 51

Offset Constraint 52

Copying and Pasting with constraints 55

Angle Constraint 56

Explode 60

Advanced Constraint Options 63

Fix Together Constraint 64

Quick Constraint 65

Changing a Constraint 66

Reusing Patterns 69

Weld Feature 80

Activating/Deactivating constraints 82

Inserting with Constraints 87

External References 90

Assembly Features 96

Hole 96

Add 107

Remove 108

Symmetry 110

Flexible/Rigid 117

Components 120

Table of Contents, Page ii ©Wichita State University

Analysis 122

Constraints Analysis 122

Degree(s) of Freedom Analysis 124

Dependencies 125

Mechanical Structure 128

Component Constraints 130

Reordering Constraints 131

Modify 136

Scenes 142

Search and Selection Sets 149

Table of Contents, Page iii

© Wichita State University

DMU Space Analysis Introduction 161

Pull Down Menus 161

Insert 161

Tools 162

Analyze 163

DMU Space Analysis Workbench 164

DMU Space Analysis 165

Measure 166

Measure Between 167

Measure Item 176

Measuring an Arc Using 3 Points 179

Measure Inertia 181

Clash Analysis 184

Sectioning 188

Distance 200

Compare 204

3D Annotations 207

2D Annotated Views 209

Manage Annotated Views 215

Review 217

Capturing Pictures 221

Using the Photo Album 226

Table of Contents, Page iv ©Wichita State University

DMU Navigator Introduction 233

Pull Down Menus 233

View 233

Insert 234

Tools 235

DMU Navigator Workbench 236

DMU Navigator 237

Publish 237

Hyperlinks 240

Current Selection Window 241

Spatial Query 243

Reviews 246

Presentations 249

Simulation Player 253

Flying 256

Viewpoints 260

Translation or Rotation 268

Snap 270

Reset Position 272

Practice Problems 275

Problem #1 275

Problem #2 276

Problem #3 277

Problem #4 278

Problem #5 280

Problem #6 284

Problem #7 285

Problem #8 287

Appendix A 289

General - Display - Navigation 289

General - Display - Performances 290

General - Parameters and Measure - Measure Tools 291

Infrastructure - Product Structure - Product Structure 292

Mechanical Design - Assembly Design - General 293

Mechanical Design - Assembly Design - Constraints 295

Mechanical Design - Assembly Design - DMU Sectioning 296

Digital Mockup - General 297

Digital Mockup - DMU Navigator 298

Digital Mockup - DMU Space Analysis - DMU Clash 299

Digital Mockup - DMU Space Analysis - DMU Distance 300

Appendix B 301

Save Management 301

Assembly Design - Inserting documents, Page 11

© Wichita State University

Assembly Design

The first section of this manual will involve inserting, creating, and replacing documentsand other components in the assembly design Those documents can be a variety of thingsincluding parts and other assemblies

Assembly Design - Inserting documents, Page 12 ©Wichita State University

Output Gear

Drill Chuck 1

Drill Bit 1

Start a new product document This can be accomplished by selecting the new icon and

selecting product You need to make sure you are in the assembly design workbench beforecontinuing To switch to the assembly design workbench select the change workbench iconand then select assembly design

One of the most important ideas to keep in mind with assembly design is that all parts musthave an unique id The assembly should also have an unique id, especially if it is going to

be used as a sub-assembly

Using the third mouse button select Product1 This will bring up the contextual menu for

Product1.

Select Properties and then the Product Tab This is where various information about the

assembly, as well as individual parts can be stored Filling in all of the information is not

necessary, but can become quite useful to a down stream user For now, the Part Number is

the only field that will be changed, but feel free to fill in any of the other fields

Assembly Design - Inserting documents, Page 13

© Wichita State University

Change the Part Number to Hand Drill Select OK when done This will give the

assembly an unique id, so that in case this was to be used in a larger assembly, say a garagemock-up, then there would be no conflicts

Select the existing component icon. The icon will highlight and is waiting for theuser to select a product to insert the component into

Select Hand Drill This will define what product the component will be placed into A File

Selection window appears.

Double select the Assembly Basics directory and selectCase 1.

Select Open The first case is now inserted into the hand drill product The other

components will be inserted to complete the assembly

Select the existing component icon, and select Hand Drill The File Selection window

will automatically open to the Assembly Basics directory.

SelectDrive Gear, and select Open The drive gear is inserted into the assembly,

pre-positioned If so desired, the case can be hidden to reveal the drive gear better Be sure tohave all parts shown before continuing Notice some of the components can be made into asub-assembly For example, the output gear and drill chuck can be combined together Thiscan either be done before hand, as with the handle assembly that you are going to insertlater, or the sub-assemblies can be generated on-the-fly as you will do next

Select the product icon and select Hand Drill. This will insert a new product into

the assembly A Part Number window appears.

Assembly Design - Inserting documents, Page 14 ©Wichita State University

A part number must be assigned to the new product Part numbers can either be generated

by the computer or generated on-the-fly The option to change how new product part

numbers are generated is under Tools, Options, Infrastructure, Product Structure, Product

Structure tab, and Part Number Manual Input Your system is set up for manual input of

the part number To insure your ability to distinguish between the different products, youwill name this one Output Assembly

Key Output Assembly in the Part Number window and select OK This will change the

instance name, allowing for better model management Now that you have a nested productassembly, a product within a product, you need to make sure that you insert new and

existing components into the proper product

Select the existing component icon and select Output Assembly Again, the File Selection

window displays This time you will insert multiple components at the same time

Select Output Gear, hold down Ctrl on the keyboard, and select Drill Chuck 1, then

select Open This will insert both documents into the Output Assembly product You can

expand the Output Assembly product to reveal this by selecting on the plus sign next to it.

The handle assembly is already put together as a separate product You will insert this next

Insert an existing component into Hand Drill The File Selection window will show

again

SelectHandle Assembly and then Open This inserts the Handle Assembly into the

Hand Drill assembly You can expand this sub-assembly by selecting the plus sign next to

it

InsertDrill Bit 1 into the Hand Drill assembly This completes the Hand Drill assembly.

The specification tree should appear similar to the diagram shown below You will

probably have to expand some of the branches

Assembly Design - Inserting documents, Page 15

© Wichita State University

This is how CATIA represents your assemblies It is structured in the same way it wasexplained earlier except in a tree form instead of a chart form as shown below

Congratulations This completes your first assembly

Save your document When you save your document the following window should appear:

It gives you this message because the new assembly that you created, Output Assembly, was never saved separately If you select Yes then both the Hand Drill and the Output Assembly

will be saved

Select Yes.

No constraints have been placed on this assembly, therefore all the parts are completely free

to move Since all of the parts were created in the correct positions they inserted in thecorrect placement Many times the models will not insert into the proper place and willneed constraints to position them properly You will learn how to constrain parts later inthis course

Assembly Design - Inserting documents, Page 16 ©Wichita State University

You are going to take a moment to investigate a few things about the assembly Looking atthe tree you see you have two different icons next to the various components in the tree Asyou work with assemblies you will notice that there are many different icons that appearnext to the components, each one tells you something about the component Sometimes theicons only differ by the color of the gears so you need to pay close attention to the

specification tree The two icons that you currently have represent a part or a product

Part Product

As you go through this course you will be studying the specification tree from time to time.The tree holds a lot of information about your assembly and you need to be very familiarwith it

The other important aspect of an assembly that you need to understand is the links that existbetween the assembly and its components When you saved your assembly earlier, only two

items were saved because the other components did not have any modifications The Hand

Drill assembly was saved along with the Output Assembly When an assembly is stored it

only contains pointers to the particular files and does not contain the data itself This

changes a little bit when other options are introduced Therefore if you were to delete one

of the parts that exist in the assembly, the assembly will have a broken link when you open

it If you want to see the links that exist for a particular component you just need to make

sure it is active and select pull down menu Edit, Links The active component has a blue

box around it In order to make an component active you need to double click the

component

Select pull down menu Edit, Links The Hand Drill should be the active component The

Link window should appear Notice that the Hand Drill assembly contains five links and

that they are all OK Links will be discussed in more detail later in class.

Select Cancel You will continue to investigate some of the other options.

Assembly Design - Replacing and Creating, Page 17

© Wichita State University

Replacing and Creating New Parts

This exercise will be a continuation of the previous exercise If the document is not alreadyopened, it will need to be opened before beginning this exercise In many instances it isnecessary to change a part of an assembly because of optional designs that could be usedwith that assembly This exercise will cover how to replace components with other

components without having to recreate the entire assembly In the case of the hand drillthere are multiple options that are available such as a different case, drill chuck and drill bitthat could be used on this assembly Instead of creating a new assembly for every option,you will learn how to replace each component in order to show the different options of thedesign

Select the replace component icon and select Case. This brings up the File

Selection window A Browse window will appear but will not be used Case will be

replaced withCase 2.

SelectCase 2 and then Open An Impacts On Replace window appears This will show

all of the elements that will be affected by the replace operation In this example there are

no elements that will be affected In addition to that, CATIA wants to know if it should

replace all instances of the Case with Case 2 Since there is only one instance of the Case it

will not make a difference But, if there were a dozen bolts that needed replaced, you would

want to select Yes.

Select No and select OK This will replace Case with Ergo Case Any component, or

product can be replaced in the same fashion You will replace other components next

Expand the Output Assembly if it is not already expanded Remember you can do this

by selecting the plus sign to the left of the assembly

Replace the Drill Chuck with Drill Chuck 2 This will replace Drill Chuck with Large

Chuck The new drill chuck displays.

Replace the Drill Bit with Drill Bit 2 This will replace Drill Bit with Large Drill Bit.

Notice the drill bit should really be included with the Output Assembly.

Assembly Design - Replacing and Creating, Page 18 ©Wichita State University

Select and hold the first mouse button on the Large Drill Bit and drag it to the Output

Assembly and release the button This should move the drill bit to the sub-assembly.

Working with sub-assemblies is an excellent way to manage models and the respectivecomponents

Next a wall mount will be created within the assembly First, a part number will need to bespecified, then an origin

Select the part icon and then select Hand Drill. This will insert a new part into the

Hand Drill assembly or product As mentioned before you will have to specify a part

number for the new part

Assembly Design - Replacing and Creating, Page 19

© Wichita State University

Key Wall Mount in the Part Number window and select OK This will make the part

number of the new part to be Wall Mount and it should appear in your specification tree A

New Part: Origin Point window appears asking where the origin is to be located.

Selecting Yes will allow you to define a new origin point for the part Selecting No will use

the origin of the assembly as the origin of the new part

Select No This will define the origin of the new part to be the same as that of the assembly.

You will now create the wall mount None of the other components will be used to designthe wall mount, although, later in this course you will be using other components to helpwith your design It is advisable that all of the components be hidden, with the exception of

the Wall Mount and possibly the Ergo Case for orientation purposes This can be

accomplished by selecting the components and then using the third mouse button choose

Hide/Show, or by selecting the components and then select the hide/show icon in the bottom

toolbar

Assembly Design - Replacing and Creating, Page 20 ©Wichita State University

Expand the Wall Mount component until PartBody is accessible This can be

accomplished by selecting the plus (+) next to the component and part icons

Double select PartBody with the first mouse button This will switch you to the Part

Design workbench Notice that the active component is now the Wall Mount part You can

now build the necessary geometry for the wall mount

Assembly Design - Replacing and Creating, Page 21

© Wichita State University

Create the wall mount Drawings are shown below with the location of the mount in

relation to the axes It is suggested that you use the yz plane for the sketch of the initial pad

Double select Hand Drill This will return you to the Assembly Design workbench.

Assembly Design - Replacing and Creating, Page 22 ©Wichita State University

Collapse the Wall Mount branch and show all of the components to look at the final

design It should look like the following.

Save your document The Save window appears again because when you save the Hand

Drill assembly, it is also going to save the Wall Mount part and the Output Assembly with its

changes

Assembly Design - Reordering & Numbering, Page 23

© Wichita State University

Reordering and Numbering the tree

With the assembly complete, you will look at two other options for assembly management

Select the graph tree reordering icon. This will allow you to reorder the tree Sincethe components are not related to each other in terms of order of creation, as in part design,they can be reordered at will

Select Hand Drill The Graph tree reordering window should appear Notice that only the

parts and sub-assemblies appear that are under the Hand Drill assembly and not the parts

that make up the assemblies If you want to reorder the components of the

sub-assemblies, you can either reorder them while having the particular sub-assembly opened or

you can select that sub-assembly instead of selecting Hand Drill.

The up and down arrows allow the highlighted part to be moved higher or lower in the treerespectively The third icon moves the selected part to another selected location This could

be useful to help organize a large assembly by reordering components to be listed together

in the specification tree In any case it is nice to know that you do not have to insert all ofyour components in a specific order, you can always reorder them later

Move the Ergo Case to the bottom of the tree and select Apply when done This can be

done by selecting the Ergo Case and then selecting the down arrow until it is on the bottom

of the list The tree will be reordered when Apply is selected As you can see, it is fairly

simple to reorder components of the assembly If you have a large number of components,

it may be better to use the third icon to position the component at a particular locationwithout having to select the up or down arrows multiple times

Using the third icon move Drive Gear to the location Handle Assembly Notice that

Drive Gear appears after Handle Assembly now.

Assembly Design - Reordering & Numbering, Page 24 ©Wichita State University

Select OK Remember you have to select Apply or OK in order for the reorder to take

effect

Next, you will generate numbering for the assembly

Select the generate numbering icon. Generating numbers shows no visual change inthe assembly It assigns numbers or letters to the parts within the assembly They in turncan show up in the bill of material when it is generated as well as in balloon call outs indrafting

Select Hand Drill The Generate Numbering window appears.

The Mode determines whether you are assigning integers or letters to the parts within the assembly Existing numbers will allow you to keep numbers that have already been

assigned or you can replace them In this case you have not assigned any numbers thereforethe options are not available

Select OK Numbers are now assigned to all the individual parts of the hand drill.